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Fair Value Measurements Fair Value Measurements - Level 3 Activity (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent consideration, balance at | $ 19,000 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Contingent consideration, balance at | 38,646 | 22,510
Additions from acquisitions | 16,875 | 24,885
Payments | (6,008) | (9,065)
(Gain)/loss included in earnings | (11,463) | 253
Reversals | (19,129) |
Foreign currency translation | 62 | 63
Contingent consideration, balance at | 18,983 | 38,646
Cost of Sales [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
(Gain)/loss included in earnings | (6,700) |
General, Administrative, Integration, and Other [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
(Gain)/loss included in earnings | $ (4,800) |

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